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To cope with large payloads, the substrate incorporate 2 sets of services.

Compression/Decompression service: The substrate incorporate support for zlib based compression and decompression of payloads.

Fragmentation/Coalescing Service: These service can break up a large payload into smaller fragments. The coalescing service can take these smaller fragments and coalesce them into the original large payload.

This was used to deal with transfer of large payloads (up to 1 GB) in the NB enhanced Grid-FTP application.